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Command line to remove an environment variable from the OS level configuration
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To remove the variable from the current environment (not permanently):
set FOOBAR=
To permanently remove the variable from the user environment (which is the default place setx puts it):
REG delete HKCU\Environment /F /V FOOBAR
If the variable is set in the system e...
Why would one use the Publish/Subscribe pattern (in JS/jQuery)?
So, a colleague introduced me to the publish/subscribe pattern (in JS/jQuery), but I'm having a hard time getting to grips with why one would use this pattern over 'normal' JavaScript/jQuery.
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How to add include path in Qt Creator?
...ake, the standard Qt build system, just add a line to the .pro file as documented in the qmake Variable Reference:
INCLUDEPATH += <your path>
If you are using your own build system, you create a project by selecting "Import of Makefile-based project". This will create some files in your pr...
Make EditText ReadOnly
... edited Oct 24 '12 at 10:40
Mehul Mistri
14.7k1414 gold badges6464 silver badges9393 bronze badges
answered Jun 17 '11 at 9:47
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Listing all permutations of a string/integer
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First of all: it smells like recursion of course!
Since you also wanted to know the principle, I did my best to explain it human language. I think recursion is very easy most of the times. You only have to grasp two steps:
The first step
All ...
How to comment lines in rails html.erb files? [duplicate]
Am a newbie to rails ,
please let me know the way to comment out a single line and also to comment out
a block of lines in *.html.erb files.
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How to concatenate strings in twig
Anyone knows how to concatenate strings in twig? I want to do something like:
11 Answers
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PHP: How to handle
I noticed that when using SimpleXMLElement on a document that contains those CDATA tags, the content is always NULL . How do I fix this?
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Rails where condition using NOT NIL
...id: nil })
When working with scopes between tables, I prefer to leverage merge so that I can use existing scopes more easily.
Foo.includes(:bar).merge(Bar.where.not(id: nil))
Also, since includes does not always choose a join strategy, you should use references here as well, otherwise you may e...
Hide all warnings in ipython
... I'm leaving this question and answer for the record in case anyone else comes across the same issue.
Quite often it is useful to see a warning once. This can be set by:
warnings.filterwarnings(action='once')
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